bonjour
4 x - 5 = 9 x + 4
4 x - 9 x = 4 + 5
- 5 x = 9
x = - 9/5
x² + 3 - x = x² + 10 x - 7
x² - x² - x - 10 x = - 7 - 3
- 11 x = - 10
x = 10/11
1/2 + 4 x = 5 - 6 x /7
7/14 + 56 x/14 = 70/14 - 12 x /14
56 x + 12 x = 70 - 7
68 x = 63
x = 63/68
5 x = 5 x - 10 + 3
5 x - 5 x = - 7
0 x = - 7
comprends pas la f x ⁺ ?
